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Hydrothermal construction of flower‐like CuS microsphere electrocatalysts for hydrogen evolution reactions in alkaline fresh water, alkaline seawater, and seawater.

Hydrothermal construction of flower‐like CuS microsphere electrocatalysts for hydrogen evolution reactions in alkaline fresh water, alkaline seawater, and seawater.

Authors :
Marimuthu, Thandapani
Yuvakkumar, Rathinam
Ravi, Ganesan
Xu, Xueqing
Xu, Gang
Velauthapillai, Dhayalan
Source :
International Journal of Energy Research; Nov2022, Vol. 46 Issue 14, p19723-19736, 14p
Publication Year :
2022

Abstract

Summary: Green hydrogen energy production from electrocatalysts produced via low‐temperature hydrothermal method with easy preparation and cost effectiveness has attracted attention as an alternative to high‐temperature nitration, phosphide, and sulfonation processes. Hence, in this work with consideration of previous works, we have prepared low temperatures (60°C‐80°C) surfactant assisted copper sulfide (CuS) spherical flower‐like microsphere morphologies with the help of the hydrothermal technique. The product exhibited a single CuS covellite phase at 60°C, whereas the increase in hydrate phase was also observed along with the CuS phase at 70°C and 80°C. SEM and TEM analyses revealed that increase in the size of flower‐like microsphere morphology with the covellite phase was observed with an increase in reaction temperatures. The vibrational mode at 616 and 472 cm−1 confirmed the formation of CuS in FTIR and Raman spectra respectively. The CuS catalyst obtained at 80°C achieved low 176, 199, and 458 mV overpotentials to get 10 mA/cm2 in 1 M KOH of distilled water, 1 M KOH of seawater, and natural seawater compared to other CuS catalysts on account of the higher surface area of 16.19 m2/g. The CuS catalyst prepared at 80°C showed low charge transfer resistance (Rct) at catalyst/seawater interface compared to other catalysts with the retention of 74.1% in natural seawater after 10 h stability examination. Structural and compositional studies of the CuS catalyst prepared at 80°C after 10 h stability examination confirmed white Mg(OH)2 and Ca(OH)2 precipitate formation on CuS surface. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0363907X
Volume :
46
Issue :
14
Database :
Complementary Index
Journal :
International Journal of Energy Research
Publication Type :
Academic Journal
Accession number :
159738254
Full Text :
https://doi.org/10.1002/er.8655